NEW YORK (CBSNewYork) — Police are searching for the suspect who gunned down a teenager Monday in Brooklyn.

Chopper 2 was over the scene on Rockaway Avenue and Fulton Street in the Ocean Hill section where a 19-year-old man was shot around 10 a.m.

READ MORE: Yonkers Officer In ICU After Jumping Over Banister During Confrontation With Gunman In Apartment Building

Akin Greggs said the gunfire near a construction site could’ve been mistaken for noise coming from the lot. But Greggs said he knew right away shots were fired.

“Only heard the shots, we just saw the kid running,” he told CBS2’s Thalia Perez. “At first, we weren’t sure if he was the shooter or not, but then when he came out of the store and you could kind of see him kind of bleeding, so we knew that he was a victim.”

Police said the victim was shot in the torso and rushed to Brookdale Hospital.

Somers and Fulton streets remained taped off hours after the shooting while police searched around trailers and in the leaves near the scene.

A construction worker said he recorded cellphone video of a man running away from the scene up Fulton Street.

READ MORE: 'A Tragic Loss Of Life:' Michelle Go Remembered As Selfless Volunteer After Deadly Subway Push In Times Square

Workers at a deli about a block away said the victim was carrying a backpack and sought help there before he collapsed to the ground.

“He rolled up his sweater. I seen the hole,” said the deli’s owner Shukri Alvalalie.

Jennifer Padilla said she and other workers stayed with the man until EMS arrived.

“He was like, ‘Help, help me.’ He was like, ‘I can’t breathe.’ He was just crying for help. He was scared, he was very scared,” Padilla said. “We tried to just tell him, ‘Try to stay calm, try to stay calm.'”

Police said no arrests have been made so far and the investigation is ongoing.

MORE NEWS: Driver Charged After 15-Year-Old Girl Struck, Killed By School Bus In Brooklyn Hit-And-Run

CBS2’s Thalia Perez contributed to this report.

CBSNewYork Team